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Light source color rendering ability, called to object color, is by reference or benchmark with the same color temperature of a light source (incandescent bulbs or sunlight) comparison of object color appearance under. The spectral content of optical emission light source light color, but color can be used by many, and a few even into just two monochrome light even though, the color of each color are not the same. Same light color of different spectral composition of light, wide spectral composition of the light source are more likely to provide better color quality.

Expressed in absolute temperature, k, is a standard black body heating, temperature increases to a certain degree of color from red-light red-orange-white-blue, changing light and bold colors are the same, the absolute temperature of the black body at that time called the color temperature of the light source.

LED Voltage is commonly referred to as LED forward voltage, say, LED to supply cathode cathode, negative power supply negative terminal. Relationship between voltage and color, red, yellow, yellow-green and the voltage is between 1.8-2.4V. The voltage is between 3.0-3.6V for white, blue, green,

LED direct limit (IF) current is 20MA, and LED light current not greater than IF, about 15MA-18MA. LED luminous intensity is proportional to and IF only in a certain range, when IF>20MA, and brightness enhancement cannot out with the naked eye.

LED chip manufacturing is mainly to manufacture effective and reliable low-ohmic contact electrodes, and between the contact materials which can meet the minimum pressure drop and the welding line of pressure pad,

Usually produced per unit of input power of light called the photoelectric conversion efficiency referred to as luminous efficiency. According to the law of conservation of energy, power LED will eventually by light and heat released in two forms,